He back-probed Pin B13. The ECU wasn't grounding it. He swapped a known-good ECU from his shelf. The pump roared. Dead driver transistor inside the original ECU. Second ghost: a tiny, fried semiconductor.
He cleaned the grounding bolt near the intake manifold—green with corrosion—until it shone like silver. 4s-fe ecu pinout
Pin D3 (Black/Orange) – . Sensor ground. He touched Pin C10 (sensor positive) and Pin D3 (ground) with his multimeter. The reading jumped like a startled cat. Bad ground. He back-probed Pin B13
He traced it back. A mouse had chewed through the shielded wire near the distributor. One ghost exorcised. 4s-fe ecu pinout
